表面处理对复合材料母板与维修补片粘接强度的影响

EFFECT OF SURFACE TREATMENT ON BOND STRENGTH OF THE BASE LAMINATE AND REPAIR PATCHES

在复合材料挖补修理过程中,维修母板、胶膜以及补片之间的结合强度是影响修复效果的主要因素,工程上常常通过表面处理来提高粘接修复强度。本文使用高频脉冲紫外激光对复合材料进行剥蚀处理,使用38μm(400目)砂纸打磨复合材料表面,然后再使用低温等离子处理,使用38μm(400目)砂纸对复合材料表面进行打磨,采用X射线光电子能谱分析仪对复合材料表面的物相特征进行了分析,通过搭接试验测试表面处理后的接头拉伸剪切强度,根据实验现象分析了搭接接头的剪切破坏机理。结果表明:激光处理和砂纸加等离子处理后的试件剪切强度均高于砂纸打磨后的试件的剪切强度,分别提高了17.9%和10.9%,激光剥蚀和等离子处理可以提高表面活性,含氧官能团增加,氧元素含量分别是原始表面的2.2倍和1.7倍。

In the process of repairing composite materials, the bonding strength between the base laminate, the film and the patches is the main factor affecting the repairing effect. The surface treatment is often used to improve the bonding repair strength. In this paper, the composite material was ablated using a high-frequency pulsed ultraviolet laser, and the surface of the composite was polished with 38 μm (400 mesh) sandpaper followed by low temperature plasma treatment, and then the surface of the composite was polished again with 38 μm (400 mesh) sandpaper. The phase characteristics of the composite surface were analyzed by X-ray photoelectron spectroscopy. The tensile shear strength of the joint after surface treatment was tested by lap test. The shear failure mechanism of the lap joint was analyzed according to the experimental phenomenon. The results show that the shear strength of the specimen after laser treatment and sandpaper plus plasma treatment is higher than that of the specimen after sanding, which is increased by 17.9% and 10.9%, respectively. Laser ablation and plasma treatment can improve surface activity. The oxygen-containing functional group is increased, and the oxygen content is 2.2 times and 1.7 times that of the original surface, respectively.